Respuesta :
The answer for the given question above would be the last option. The line that best explains what the speaker gains from nature based on the poem "Summer" is gathering strength for efforts yet to come. Hope this answers your question.
In the poem "Summer," the line that best explains what the speaker gains from nature is, "gathering strength for efforts yet to come."
The line that would support this statement would have to show how the speaker would benifit from nature. The other lines explain the glorious beauty of the nature like how it changes, the color, and how it is full of life. However, they do not best explain what the speaker gains from nature, which is strength.